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TECHNICAL PAPERS

Thermal Induced Stresses in Bridge-Wire Initiator Glass-to-Metal Seals

[+] Author and Article Information
Luke M. Thompson, Karl K. Rink, Donald M. Blackketter, Robert R. Stephens

Mechanical Engineering Department, University of Idaho, Moscow, ID 83843

Michael R. Maughan1

Mechanical Engineering Department, University of Idaho, Moscow, ID 83843maughan@vandals.uidaho.edu

1

Corresponding author.

J. Electron. Packag 129(3), 300-306 (Nov 29, 2006) (7 pages) doi:10.1115/1.2753920 History: Received May 24, 2006; Revised November 29, 2006

Cracks have been observed in the insulating glass of bridge-wire initiators that may allow moisture to penetrate the assembly, potentially leading to the corrosion and degradation of the bridge wire and the pyrotechnic material. Degradation of the pyrotechnic or the bridge wire may result in initiator failure or diminished performance. The goal of this research is to determine if the manufacturing processes could produce thermal stresses great enough to crack the glass. A parametric plane stress closed-form solution was used to determine the effects of changing material properties and dimensions of the initiator, and to determine potential stresses within the initiator from two different manufacturing scenarios. To verify and expand the plane stress closed-form solution, a two-dimensional axisymmetric finite element analysis was performed. To reproduce the two manufacturing scenarios, lumped models and models that included the effects of cooling the initiator were used. Both models showed that if the manufacturing process involves pouring molten glass into the initiator, the potential for cracking exists. Furthermore, if the surface of the initiator cools faster than the center, cracking is more likely.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Crack in initiator GTMS

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Figure 2

Basic elements of a bridge-wire initiator

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Figure 3

Idealized header/electrode/GTMS assembly

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Figure 4

Stress profiles and critical stress locations considered during the parametric study

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Figure 5

Axisymmetric finite element mesh of the airbag initiator

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Figure 6

Critical stresses from case 1 of the parametric study

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Figure 7

CFS tangential and radial stress versus radial position for uniform temperature change from 467°Cto20°C

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Figure 8

CFS tangential and radial stress versus radial position for pouring molten glass into initiator and cooling from 467°Cto20°C

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Figure 9

FEA critical stress locations

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Figure 10

Tangential stress versus radial position for the UITLA model and closed-form solution

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